SAp-Bach management

I am working in REM.( repetitive manufacturing) I am trying to activate batch management but system is giving error like stock exists at storage loc. But when we see the stock through MMbe or MB5b there is no stock. also there is no reservation. procurement type is E. So no question of po or PR exists. Only plan order are there. What would be the reson system not allowing to activate the batch. How do we resolve this.
reagrds,
Vyankatesh Deshpande

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